Question

A new penny has a mass of 2.49 grams and occupies 0.349 cm cubed. If pure copper has a density of 8.96 g/cm cubed, is the new penny put copper?

Answer 1

Answer: The new penny is not pure copper

Step-by-step explanation:

Density
`\rho` is defined as a relation between the mass
`m` and the volume
`V`:

`\rho=(m)/(V)`

Now, we are told the density of pure copper is:

`\rho_(copper)=8.96 g/cm^(3)`

And we are given the mass and volume of the new penny, with which we can calculate its density:

`\rho_(penny)=(m_(penny))/(V_(penny))=(2.49 g)/(0.349 cm^(3))`

`\rho_(penny)=7.13 g/cm^(3)` As we can see the density of this penny is not equal to the density of pure copper, hence the new penny is not pure copper.